Chemical Engineering MCQs

Page No. 42

Oxidation of ammonia is________________?


aExothermic


bEndothermic


cNon-catalytic


dAutocatalytic


View Answer Exothermic

In the manufacture of H3 PO4 (ortho); strong H2 SO4 leaching wet process as compared to electric furnace process___________________?


aUses lower grade phosphate rock


bRequires lower capital investment in the plant


cProduces lower purity acid


d Is very costly



Though liquid ammonia itself is a fertiliser (with 82% nitrogen content) yet it is commonly not used as such in a tropical country like India, because it___________________?


aHas a pungent smell


bVaporises at normal temperature


cIs toxic and highly corrosive


dIs in short supply



pH value of soil is maintained at ______________ by the addition of fertiliser for optimum growth and health of the plant?


a4-5


b7-8


c 9-10


d12-13


View Answer 7-8

Which of the following fertilisers contains the least percentage of nitrogen ?


aLiquid ammonia


bUrea


cAmmonium phosphate


dAmmonium sulphate


View Answer Ammonium phosphate

Heating a mixture of phosphate rock, coke and sand in an electric furnace produces___________________?


aPhosphoric acid


bAmmonium phosphate


cPhosphorous


dSuperphosphate


View Answer Phosphorous

Catalyst used in steam reforming of naphtha is ___________________?


aBauxite


bCobalt


cNickel oxide on alumina support


dChromium



Liquid ammonia and 60% nitric acid reaction (which produces ammonium nitrate) is___________________?


aExothermic


bEndothermic


cAutocatalytic


dNone of these


View Answer Exothermic

Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about ______________ ppm?


a< 1


b10-100


c100-200


d100-1000


View Answer < 1

For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than ______________ ppm?


a10000


b 5


c500


d1000


View Answer 5

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